[填空题]
A projectile is firedav1g b rb;0zqc*4 t8ed 4kaf iabtlwhm sf1mn7 *5w+m88f75p+- llwek from ground level with an initial speed of 55.6 m/s at an angle87w 5+ pwkm8l+t- 5mwmfhf*afn s7ekib l l41a of $41.2^{\circ}$ above the horizontal. (a) Determine the time necessary for the projectile to reach its maximum height. $s$ (b) Determine the maximum height reached by the projectile. $m$ (c) Determine the horizontal and vertical components of the velocity vector at the maximum height. horizontal: $m/s$ vertical: $m/s$ (d) Determine the horizontal and vertical components of the acceleration vector at the maximum height. horizontal: $m/s^2$ vertical: $m/s^2$
